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Microencapsulation of Eicosane with Suspension and Emulsion Copolymerizations of PMMA
Bona Choi(최보나),Jeong Soo Kim(김정수) 한국고분자학회 2019 폴리머 Vol.43 No.1
파라핀계 상변환 축열재의 응용 확대를 위해 모델 물질로 탄소수 20개인 아이코산을 택하고 이를 분산중합에 의해 미세캡슐화한 후 그 축열 거동을 관찰하였다. 메틸 메타크릴레이트(MMA)을 기본 단량체로 하고 유화중합법과 현탁중합법이 사용되었으며, 공단량체로는 메틸 메타크릴산(MAA), 에틸 메타크릴레이트(EMA), 부틸 메타크릴레이트(BMA)가 사용되었다. 미세캡슐화 방법을 달리하는 인자로는 중합법, 공단량체의 종류 및 무게분율, 가교제의 종류 및 투입량이 있다. 미세캡슐화 입자의 모폴로지, 입자 크기, 미세피낭 효율, 열적 거동 등이 관찰되었으며, 이들의 관찰은 FTIR, SEM, DSC, TGA를 통해 이루어졌다. Eicosane, which is a saturated linear hydrocarbon with 20 carbons, was selected as a core phase change material (PCM) for microencapsulation with dispersion polymerizations. The microencapsulation reactions were carried out by emulsion and suspension copolymerization of methyl methacrylate (MMA) with comonomers such as methacrylic acid (MAA), ethyl methacrylate (EMA), and butyl methacrylate (BMA). The preparation methods were diversified through varying different factors, such as polymerization method, the kinds and composition of comonomers, and crosslinking agents. The morphology, particle sizes, and thermal properties including encapsulation efficiency of the prepared microcapsules were analyzed using Fourier transform infrared spectroscopy, scanning electron microscopy, differential scanning calorimetry, and thermogravimetric analysis.
Considerations during crown reattachment procedure over the pulpal exposure: case report
Bona Kim,Yoon Lee,Min-Ju Song,Su-Jung Shin,Jeong-Won Park 大韓齒科保存學會 2012 Restorative Dentistry & Endodontics Vol.37 No.4
Crown reattachment is the most conservative treatment which can be used to restore fractured tooth, presumably with sufficient strength, while maintaining original contour, incisal translucency, and reducing chair time and cost. However, in case of crown fracture with pin-point pulp exposure, we should cautiously minimize the irritation to the pulp and consider pre-treatment pulpal status, choice of pulp capping materials, choice of bonding system and treatment sequence during crown reattachment procedures. This case reports the considerations while crown reattachment with direct pulp capping using calcium hydroxide (Dycal, Dentsply Caulk).
Differentiation of human labia minora dermis-derived fibroblasts into insulin-producing cells
Bona Kim,Byung Sun Yoon,Jai-Hee Moon,Jonggun Kim,Eun Kyoung Jun,Jung Han Lee,Jun Sung Kim,Cheong Soon Baik,김애리,황광연,유승권 생화학분자생물학회 2012 Experimental and molecular medicine Vol.44 No.1
Recent evidence has suggested that human skin fibroblasts may represent a novel source of therapeutic stem cells. In this study, we report a 3-stage method to induce the differentiation of skin fibroblasts into insulin-producing cells (IPCs). In stage 1, we establish the isolation, expansion and characterization of mesenchymal stem cells from human labia minora dermis-derived fibroblasts (hLMDFs) (stage 1: MSC expansion). hLMDFs express the typical mesenchymal stem cell marker proteins and can differentiate into adipocytes,osteoblasts, chondrocytes or muscle cells. In stage 2, DMEM/F12 serum-free medium with ITS mix (insulin, transferrin, and selenite) is used to induce differentiation of hLMDFs into endoderm-like cells, as determined by the expression of the endoderm markers Sox17, Foxa2, and PDX1 (stage 2: mesenchymal-endoderm transition). In stage 3, cells in the mesenchymal-endoderm transition stage are treated with nicotinamide in order to further differentiate into self-assembled,3-dimensional islet cell-like clusters that express multiple genes related to pancreatic β-cell development and function (stage 3: IPC). We also found that the transplantation of IPCs can normalize blood glucose levels and rescue glucose homeostasis in streptozotocin-induced diabetic mice. These results indicate that hLMDFs have the capacity to differentiate into functionally competent IPCs and represent a potential cell-based treatment for diabetes mellitus.
On the enumeration of certain weighted graphs
Bona, M.,Ju, H.-K.,Yoshida, R. North Holland ; Elsevier Science Ltd 2007 Discrete Applied Mathematics Vol.155 No.11
We enumerate weighted simple graphs with a natural upper bound condition on the sum of the weight of adjacent vertices. We also compute the generating function of the numbers of these graphs, and prove that it is a rational function. In particular, we show that the generating function for connected bipartite simple graphs is of the form p<SUB>1</SUB>(x)/(1-x)<SUP>m+1</SUP>. For nonbipartite simple graphs, we get a generating function of the form p<SUB>2</SUB>(x)/(1-x)<SUP>m+1</SUP>(1+x)<SUP>l</SUP>. Here m is the number of vertices of the graph, p<SUB>1</SUB>(x) is a symmetric polynomial of degree at most m, p<SUB>2</SUB>(x) is a polynomial of degree at most m+l, and l is a nonnegative integer. In addition, we give computational results for various graphs.
Multidimensional analysis for fabric drapability
Bona Shin,윤창상 한국의류학회 2023 Fashion and Textiles Vol.10 No.1
This study analyzed fabric drapability in one, two, and three dimensions to provide an assessment method reflecting real conditions. One-dimensional analysis of drapability involved observing the fabric movement by reciprocating motion. The movement appeared differently depending on the fabric characteristics, and the shape and location of the node showed differently, which were considered to be influenced by the weight of the sample along with the drape coefficient. Two-dimensional analysis identified the significant factors for the drape information. This examination confirmed that, even if drape factors were similar, differences in draped shape were observed based on the factors related to node shapes. Three-dimensional analysis, using a 3D scanner, involved the use of the mean distances between draped samples and the standard truncated cone, their standard deviation, and the coefficient of variation. The coefficient of variation was high in the groups wherein the shape of the drape was irregular. In the 3D analysis, the distances between samples and the standard truncated cone were expressed in colors to intuitively deliver the drape information. To determine a factor that could indicate drapability among the factors derived from each dimension, the existing drape coefficient was employed for correlation analysis. Three pairs of samples with similar drape coefficients but different drape shapes were selected to verify the above results. In conclusion, one-dimensional node location, two-dimensional standard deviation of node severity, and three-dimensional coefficient of variation were shown to effectively demonstrate the drape characteristic that the drape coefficient could not indicate.